Quick and Easy Buying Guide
Carat weight: 1 carat = 200 milligrams = 6.5 mm diameter. Doubling weight doesn't double diameter.
Diamond clarity: FL/IF/VVS/VS = super expensive, near perfect. SI = best value if you can check a photo for obvious inclusions (defects).
Color: D-G = colorless, expensive, only if you have money to burn. H-J = best value. Can go lower in gold metal settings than white metal.
Cut: Better cut ratings let more light into a diamond, making it sparkle more. Very important property, don't skimp here.
Set a budget and minimum cut (Premium). Go J color for gold and I/H for white metals. Go searching for SI1/SI2 clarity diamonds at James Allen. Pick a diamond with small/no inclusions. Choose a ring setting and buy it risk-free (60-day returns).
2.61 Carat Princess Shape Diamond Actual Size
This article includes a useful picture that gives you the apparent size of a 2.61 carat size princess shape diamond, when it's actually on a typical woman's hand. A princess shape stone with a carat weight of 2.61 is usually about 10.7 mm long on the side, although this can depend on the depth of the cut.
The picture in this page has a ring of L 1/2 ring size, which is typical or perhaps on the small side of typical for a female ring.
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Long slender fingers will affect how a diamond appears as much as the carat size of the diamond - so look beyond just considering the 2.61 carat weight of this princess diamond.